Leg extension arm for an exercise machine



FIG. 1 is a perspective view of a leg extension arm for an exercise machine showing my new design;

FIG. 2 is a perspective view from the opposite side thereof;

FIG. 3 is a side elevational view

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevational view thereof with a portion of an associated exercise machine indicated in broken line.

The broken line showing of the exercise machine structure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a leg extension arm for an exercise machine, as shown. 